A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.A.excessive purging before lighting offB.insufficient trail for ignition periodC.a faulty transformer in the ignition circuitD.insufficient purging before lighting off
A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.
A.excessive purging before lighting off
B.insufficient trail for ignition period
C.a faulty transformer in the ignition circuit
D.insufficient purging before lighting off
相关考题：
The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler() A.salinity is abnormallyB.high steam demand is tooC.feed-water flow is lowD.water level is abnormally low
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.A.high steam pressure in the boilerB.abnormally high feed-water temperatureC.abnormally high boiler water temperatureD.steam demand exceeding feed pump capacity
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
The brickwork surrounding the firebox of a boiler is known as ______．A.RefractoryB.The screen wallC.The water wallD.Fire plate
单选题Auxiliary diesel engines can be automatically shut down as a result of （）Alow lube oil temperatureBlow lube oil pressureChigh exhaust temperatureDhigh cooling water pressure
单选题The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.Aseawater contaminationBfrequent surface blowsCdissolved oxygen deaerationDfrequent bottom blows
单选题The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）Ain the event of a flame failureBin the event of a stack fireCwhen the water level reach the crown sheetDwhen the feed pump discharge pressure drops to a preset minimum
单选题Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.Afuel pump failureBfan motor failureCincreased feedwater consumptionDdecreased boiler efficiency
单选题Failure of the burner flame in an auxiliary boiler would probably be a result of（）Awater in the fuel oilBbroken high tension leadsCincorrect electrode settingDfull fuel pressure at the nozzle
单选题A distorted furnace in a fire-tube auxiliary boiler may be the result of （）Afiring for extended periods in the low fire modeBoverheating, due to waterside depositsCvarying the water level above the crown sheetDcarrying excessive alkalinity in the boiler water
单选题The water in an auxiliary boiler should be tested daily for （）.Adissolved oxygenBchloridesCsludgeDdissolved nitrogen
单选题The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）Acool the furnace to prevent pre-ignitionBremove explosive vapors from the furnaceCevaporate accumulated unburned fuel oilDprovide sufficient air in the furnace to allow ignition of the fuel
单选题The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）Asalinity is abnormally highBsteam demand is too highCwater level is abnormally lowDfeedwater flow is low
单选题The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）Asteam demand is highBsalinity is highCsafety valve simmersDburner flame is extinguished
单选题A firebox explosion in an automatically fired auxiliary boiler may be the result of （）Aexcessive purging before lighting offBinsufficient trail for ignition periodCa faulty transformer in the ignition circuitDinsufficient purging before lighting off
单选题When there is a flame failure in an automatically fired auxiliary boiler, the （）.Aair supply is shut offBfuel supply is shut offCwater supply is shut offDsafety valve lifts
单选题A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.AmonkeyBdonkeyCwaste heatDmain
单选题Excessive vibration of an automatically fired auxiliary boiler can be caused by （）Aair or water in the furnaceBcombustion pulsesCfuel oil pump failureDflame failure
单选题Ignition failure in an automatically controlled auxiliary boiler could be caused by（）Acarbon deposits on the flame scannerBhigh fuel oil temperatureClow fuel oil viscosityDhigh steam pressure
单选题The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）Aprecipitate silica from solutionBreduce corrosion in the heating coilCprevent clogging and erosion in the coilDmaintain zero water hardness
单选题Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）Aa burned out solenoid in the oil supply valveBhigh temperature excess airCincorrectly setting the hot-well dump valveDan incorrectly positioned burner snubber realy
单选题Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）Aincreased fuel consumptionBincreased feed water consumptionCfuel pump failureDcombustion control system failure
单选题The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.AwheneverBhoweverCwhereverDwhether
单选题Excessive alkalinity of the water in an auxiliary boiler can cause （）.Acaustic embrittlement of the boiler metalBacidic corrosion of the boiler metalChard scale deposits on the boiler tubesDetching of the heat exchange surfaces
单选题Flame failure in an automatically fired auxiliary boiler can from a/an （）Aincorrect electrode settingBincorrect nozzle positionCclogged fuel nozzleDbroken high tension lead
单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.Acheck and regulate the water levelBclose the air cock once fires are litCblowdown the gage glassDcrack the steam stop to assure protective steam flow
单选题The brickwork surrounding the firebox of a boiler is known as（）.ArefractoryBthe screen wallCthe water wallDfire plate